[Bug bootstrap/43681] New: bootstrap fails with "unused" var message for an apparently used var.

[Bug bootstrap/43681] New: bootstrap fails with "unused" var message for an apparently used var.

[iains at gcc dot gnu dot org]

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158099.
cc1: warnings being treated as errors
/GCC/gcc-live-trunk/gcc/expr.c: In function
‘block_move_libcall_safe_for_call_parm’:
/GCC/gcc-live-trunk/gcc/expr.c:1254:8: error: variable ‘fn’ set but not
used
make[3]: *** [expr.o] Error 1

BUT:
======
static bool
block_move_libcall_safe_for_call_parm (void)
{
#if defined (REG_PARM_STACK_SPACE)
1254==>>>  tree fn;
#endif

  /* If arguments are pushed on the stack, then they're safe.  */
  if (PUSH_ARGS)
    return true;

  /* If registers go on the stack anyway, any argument is sure to clobber
     an outgoing argument.  */
#if defined (REG_PARM_STACK_SPACE)
  fn = emit_block_move_libcall_fn (false);
  if (OUTGOING_REG_PARM_STACK_SPACE ((!fn ? NULL_TREE : TREE_TYPE (fn)))
      && REG_PARM_STACK_SPACE (fn) != 0)
    return false;
#endif

  /* If any argument goes in memory, then it might clobber an outgoing


-- 
           Summary: bootstrap fails with "unused" var message for an
                    apparently used var.
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: iains at gcc dot gnu dot org
GCC target triplet: powerpc-apple-darwin9


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43681

[Bug bootstrap/43681] bootstrap fails with "unused" var message for an apparently used var.

[jakub at gcc dot gnu dot org]

------- Comment #1 from jakub at gcc dot gnu dot org  2010-04-08 07:00 -------
Created an attachment (id=20331)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20331&action=view)
gcc46-pr43681.patch

Untested patch.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43681

[Bug bootstrap/43681] [4.6 Regression] bootstrap fails with "unused" var message for an apparently used var.

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu dot org
            Summary|bootstrap fails with        |[4.6 Regression] bootstrap
                   |"unused" var message for an |fails with "unused" var
                   |apparently used var.        |message for an apparently
                   |                            |used var.
   Target Milestone|---                         |4.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43681

[Bug bootstrap/43681] [4.6 Regression] bootstrap fails with "unused" var message for an apparently used var.

[iains at gcc dot gnu dot org]

------- Comment #2 from iains at gcc dot gnu dot org  2010-04-08 08:59 -------
(In reply to comment #1)
> Created an attachment (id=20331)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20331&action=view) [edit]
> gcc46-pr43681.patch
> 
> Untested patch.

yes, thanks that works.
- I couldn't see what to do there; 
see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43684
 for the ones I think I can resolve. 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43681

[Bug bootstrap/43681] [4.6 Regression] bootstrap fails with "unused" var message for an apparently used var.

[jakub at gcc dot gnu dot org]

------- Comment #3 from jakub at gcc dot gnu dot org  2010-04-08 10:12 -------
Subject: Bug 43681

Author: jakub
Date: Thu Apr  8 10:12:35 2010
New Revision: 158111

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=158111
Log:
        PR bootstrap/43681
        * expr.c (block_move_libcall_safe_for_call_parm): Avoid
        set but not used variable warning.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expr.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43681

[Bug bootstrap/43681] [4.6 Regression] bootstrap fails with "unused" var message for an apparently used var.

[iains at gcc dot gnu dot org]

------- Comment #4 from iains at gcc dot gnu dot org  2010-04-08 15:07 -------
bootstrapped {powerpc,i686}-apple-darwin9.
this is fixed. 
(other 'set but not used'  issues at
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43684 remain)


-- 

iains at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43681

[Bug bootstrap/43681] [4.6 Regression] bootstrap fails with "unused" var message for an apparently used var.

[ubizjak at gmail dot com]

------- Comment #5 from ubizjak at gmail dot com  2010-04-13 19:46 -------
(In reply to comment #1)
> Created an attachment (id=20331)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20331&action=view) [edit]
> gcc46-pr43681.patch
> 
> Untested patch.

How about:

Index: expr.c
===================================================================
--- expr.c      (revision 158277)
+++ expr.c      (working copy)
@@ -1251,7 +1251,7 @@
 block_move_libcall_safe_for_call_parm (void)
 {
 #if defined (REG_PARM_STACK_SPACE)
-  tree fn;
+  tree fn ATTRIBUTE_UNUSED;
 #endif

   /* If arguments are pushed on the stack, then they're safe.  */


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43681